PHP 5.4.31 Released

session_name

(PHP 4, PHP 5)

session_nameRecupera e/o imposta il nome della sessione corrente

Descrizione

string session_name ([ string $name ] )

session_name() ritorna il nome della sessione corrente. Se viene fornito name, session_name() aggiornerà il nome della sessione e restituirà il vecchio nome della sessione.

Il nome di sessione è ripristinato al valore memorizzato in session.name al momento della request. Quindi, si deve chiamare session_name() ad ogni richiesta (e prima che session_start() o session_register() vengano chiamate).

Elenco dei parametri

name

Il nome della sessione si riferisce al nome della sessione, che viene utilizzato nei cookies e negli URL (p.e. PHPSESSID). Dovrebbe contenere solo caratteri alfanumerici; dovrebbe essere corto e descrittivo (p.e. per utenti con l'avviso di cookie attivo). Se name è specificato, il nome della sessione corrente viene cambiato al suo valore.

Avviso

Il nome di sessione non può essere composto da sole cifre numeriche, deve essere presente almeno una lettera. In caso contrario un nuovo nome è generato ogni volta.

Valori restituiti

Restituisce il nome della sessione corrente.

Esempi

Example #1 session_name() esempi

<?php

// imposta il nome di sessione a WebsiteID

$previous_name session_name("WebsiteID");

echo 
"Il precedente nome di sessione è $previous_name<br />";
?>

Vedere anche:

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User Contributed Notes 5 notes

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17
Hongliang Qiang
10 years ago
This may sound no-brainer: the session_name() function will have no essential effect if you set session.auto_start to "true" in php.ini . And the obvious explanation is the session already started thus cannot be altered before the session_name() function--wherever it is in the script--is executed, same reason session_name needs to be called before session_start() as documented.

I know it is really not a big deal. But I had a quite hard time before figuring this out, and hope it might be helpful to someone like me.
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8
relsqui at chiliahedron dot com
5 years ago
Remember, kids--you MUST use session_name() first if you want to use session_set_cookie_params() to, say, change the session timeout. Otherwise it won't work, won't give any error, and nothing in the documentation (that I've seen, anyway) will explain why.

Thanks to brandan of bildungsroman.com who left a note under session_set_cookie_params() explaining this or I'd probably still be throwing my hands up about it.
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5
php at wiz dot cx
5 years ago
if you try to name a php session "example.com" it gets converted to "example_com" and everything breaks.

don't use a period in your session name.
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3
Joseph Dalrymple
3 years ago
For those wondering, this function is expensive!

On a script that was executing in a consistent 0.0025 seconds, just the use of session_name("foo") shot my execution time up to ~0.09s. By simply sacrificing session_name("foo"), I sped my script up by roughly 0.09 seconds.
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1
slave at codegrunt dot com
9 years ago
One gotcha I have noticed with session_name is that it will trigger a WARNING level error if the cookie or GET/POST variable value has something other than alphanumeric characters in it.  If your site displays warnings and uses PHP sessions this may be a way to enumerate at least some of your scripts: 

http://example.com/foo.php?session_name_here=(bad)

Warning: session_start(): The session id contains invalid characters, valid characters are only a-z, A-Z and 0-9 in /some/path/foo.php on line 666

I did not see anything in the docs suggesting that one had to sanitize the PHP session ID values before opening the session but that appears to be the case.

Unfortunately session_name() always returns true so you have to actually get to the point of assigning variables values before you know whether you have been passed bad session data (as far as I can see).  After the error has been generated in other words.

Cheers
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